GCD & LCM Calculator
Find the greatest common divisor and least common multiple of two or more numbers.
How to Find GCD and LCM
- Enter two or more whole numbers, separated by commas.
- The GCD and LCM appear instantly.
Frequently Asked Questions
How is the GCD calculated?
Using the Euclidean algorithm, a genuinely efficient and exact method that repeatedly replaces the larger number with the remainder of dividing it by the smaller number until the remainder reaches zero.
How is the LCM related to the GCD?
The LCM of two numbers equals their product divided by their GCD — a direct mathematical relationship, which is how this tool computes it after finding the GCD first.
Can I find the GCD and LCM of more than two numbers?
Yes — enter as many numbers as you like, separated by commas, and it computes the GCD and LCM across all of them at once.
Is my data sent anywhere?
No — the calculation happens entirely in your browser using JavaScript, so nothing you enter is ever sent to a server.